*{
	padding: 0;
	margin: 0;
}
#top{
	background-color: black;
	height:50px;
	width:100%;
}
.arrow{
	display: inline-block;
	position: relative;
	width:0px;
  	height:0px;
  	margin:5px 20px;
	border-bottom:20px solid transparent; 
	border-top:20px solid transparent; 
	border-right:20px solid white; 
}
#top h1{
	display: inline-block;
	position: absolute;
	top: 4px;
	color:white;
}
#center{
	margin: 20px 150px;
}
hr{
	margin:10px auto;
	width:90%; 
	color:grey;
}
#bottom{
	margin: 0 150px;
}
#bottom p{
	text-align: center;
}
.bt{
	padding: 8px 15px;
    width: 500px;
    font-size: 20px;
    line-height: 1.3333333;
    border-radius: 6px;
    margin-left: 100px;
    margin-top: 20px;
    background-color: white;
    color: dimgrey;
}
li{
	list-style-type: none;
	margin-top: 10px;
	margin-left: 30px;
}
input{
	border: none;
}
p{
	margin: 10px;
	text-indent: 2em;
}
.block{
	display: inline-block;
}
.xiushi {
    border: 1px solid #00BCD4;
    border-radius: 6px;
    margin-left: 50px;
    padding: 3px 10px;
}
#bottom img{
	margin:0 10px -5px 0;
}
.block p{
	display: inline-block;
    text-indent: 0;
    margin: 2px 5px;
}